JPS61502238A - Waste energy recovery method and unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Waste energy recovery method and unit technology field The present invention relates to a method and unit for recovering waste energy.

Background of the invention Methods and apparatus for recovering waste energy from dishwashers and similar equipment include: Accepts hot water wastewater discharged from dishwashers, etc., and performs washing and rinsing cycles. Heat to preheat cold water to the hot water heater that supplies hot water to the dishwasher It is desirable to include an exchanger. Hot water heaters are often located some distance from the dishwasher. It is placed at The pre-heated feed water may be exposed to excessive heat while flowing to the hot water heater. Insulation is usually required to prevent excessive cooling. But waste energy The savings from the recovery of Mau.

There are generally two types of dishwashers in use, one for "hot" food. It is called a dishwasher, and the washing process is done with water at approximately 180'F or 21°C, and the waste water is is approximately 140°F' or 60'C. Generally, the cleaning water is The used waste is stored in a separate space in the dishwasher and then detergent is added to it. The hot water is directed from the hot water heater only during the flush cycle. It is. In this way, the used wash water is stored in the next wash cycle case and heated. The water heater is 190″F”! water to 195'F or 88°C or 91°C. This makes it possible to heat the Other formats are referred to as "low temperature" formats. Therefore, use special detergent. For this type, the washing time is approximately 140 years or 60°C. The waste water is approximately 125°F' or 62°C. which format Also, the amount of waste water used for washing is within the range of electric heaters.

It is an object of the present invention to utilize waste energy, especially waste energy from equipment such as dishwashers. To provide a new method and unit for recovering water, Wastewater from dishwashers is usually heated to the appropriate temperature for washing dishes by exchanging heat with washing water. providing a method and unit comprising a heat exchanger for heating food to a temperature of Can be placed near or below the dishwasher, allowing waste water and supply water to be routed through long distances of piping. We offer a unit that can supply hot water to a dishwasher without the need for a full supply of hot water. If hot water for rinsing is supplied to a high temperature dishwasher, use an electric heater. special equipment is provided to prevent the heater from overheating and the risk of fire. This special device is a unit that can be omitted if hot water is supplied to a low-temperature dishwasher. to remove small particles from the hot water that may fall from the electric beater. to provide an effective and efficient method and unit for The aim is to provide the following benefits.

Summary of the invention The energy recovery method of the present invention can be applied to cleaning services in dishwashers and other similar equipment. The wastewater generated by the cycle is collected in a collection tank located below the heat exchanger with a hollow central space. The water is supplied to a hot water heater housed within the central space of the heat exchanger. The process of flowing wastewater through a heat exchanger in countercurrent relationship with the chilled water flowing through the heat exchanger. applying heat to cold water and supplying hot water to a dishwasher or the like. child Methods such as this also include passing the supplied water through the outer space of the hot water heater to the inner space. In the inner space, electricity is circulated downward to the connection point with the lower end. Heat is provided by a dedicated heater. Such methods also prevent overpressure and Drain fluid from the hot water heater to the wastewater collection tank during At the same time, the circulating water is recirculated from the outlet to the inlet of the hot water heater, thereby to prevent hot water or steam from accumulating around the heater and overheating the electric heater. The heater is usually placed upright and is not dishwasher safe. If the extraction is not carried out due to lack of circulation, the extraction will not be carried out. stomach. The energy recovery unit according to the invention consists of coils arranged around a central space. A housing enclosing a heat exchanger with a heat exchanger and a hot water heater located in a central space. Contains zing. The hot water heater includes an upright tank and is an immersion type inside this tank. The tank is equipped with an electric heater, and the tank is equipped with inwardly spaced partitions. and is divided into an outer space and a larger inner heating space, and this partition terminates above the bottom of the tank, while the preheated water inlet It is designed to create a circular circulation within the outer space. Tank inlet and outlet A recirculation pump is installed between the two, and a pressure IJ valve is connected to the hot water heater. led through one corner of the housing to a collection tank for wastewater on the lower side. Discharge through pipes.

Other objects and novel features of the invention will be apparent from the following description taken in conjunction with the accompanying drawings. Become.

Brief description of the drawing FIG. 1 shows the energy recovery according to the invention, especially adapted for use in dishwashers. Rear elevational view of the storage unit.

Figure 2 shows the upper housing of the unit in Figure 1 with the top cover removed. FIG. 6 is an enlarged top plan view of the

Figure 6 shows the line 3-- in Figure 1 with some parts omitted for clarity. Cross-sectional view at 3.

FIG. 4 is a cross-sectional view of the lower housing taken along line 4--4 in FIG.

FIG. 5 is enlarged and a section through the upper housing taken along line 5-5 in FIG. 3 and a cross-section through the lower housing along line 5--5 in FIG. Longitudinal cross-sectional view.

FIG. 6 is an enlarged cut-away cross-sectional view taken along line 6--6 in FIG.

FIG. 7 is a longitudinal cross-sectional view taken along line 7--7 in FIG.

FIG. 8 is an enlarged view of the upper right side of FIG. 7.

FIG. 9 is an enlarged cross-sectional view of the skeleton portion shown in FIG. 8.

FIG. 10 shows an alternative energy recovery unit, specifically having an alternative water heater. FIG. 2 is a top plan view similar to FIG.

Figure 11 omits external auxiliary parts to show the internal structure, and also shows the top of the heater. and FIG. 10 is a summarized side elevation view of the unit of FIG. 10 with the bottom cut away.

Figure 12 is an enlarged top plan view of the heater tank in the unit of Figure 10. .

Figure 16 shows the tank, specifically the upper head, along line 13-13 in Figure 12. A broken cross-sectional view.

Figure 14 is a longitudinal section similar to Figure 13 but showing an alternative tank head. .

Figure 15 also shows the top plate showing tank and conduit connections for another alternative water heater. Surface diagram.

FIG. 16 is a longitudinal sectional view taken along line 16-16 in FIG. 15.

FIG. 17 is an enlarged, broken-away longitudinal cross-sectional view taken along line 17--17 in FIG. 15.

FIG. 18 is a front elevational view of the deflection plate for the water introduced.

FIG. 19 is a side elevational view of the introduced water deflection plate of FIG. 18.

FIG. 20 is a cutaway cross-sectional view taken along line 20--20 of FIG. 17.

Detailed description of the invention The energy recovery unit shown in the drawing is below the tableware cheedel of a regular dishwasher. side, or for dishwashers or other devices that supply liquids that perform heat recovery. may be placed in any other convenient location; the term ``water'' herein refers to any other It will be understood that this includes liquids of. This example uses the heat exchanger shown in FIGS. 3 and 5. The heat exchanger E includes an upper housing σ surrounding the exchanger E, which is the water heater of FIG. - Surrounding W. Heat exchanger E is a double tube heat exchanger with a hollow center part. Alternate pipes in each row are used to heat supply water and waste water from dishwashers, etc. and alternate tubes in each row carry and tubes in the outer rows, preferably alternating as well. 1984 As shown in Canadian Patent No. 1,163,792, issued March 20th. Preferably, a thermally conductive filler is disposed between the abutting tubes in such a way that the tubes are in contact with each other. No. According to the invention, the water heater W in Figure 5 occupies the space inside the coil of the heat exchanger E. It is said to have a special structure. The water heater W is an insulator at the lower end of the upper housing U. It is preferably placed on the pad 10 of. The short lower housing L is shown in Figures 5 and 5. It surrounds the holding tank T shown in Figure 7, and this tank contains waste water for washing dishes. Water flows through the entire screen 11 and from the dishwasher waste water inlet in Figures 1 and 5. Incorporate. The sun f13 in FIG. Hot water is supplied through outlet 14 in Figure 5 and piping 15 in Figure 1, and the float control switch is The level detector 18 in Figure 5, such as the switch, indicates that the pump Preventing motor 17 from being started. Pump motor 17 and therefore the pump 16 requires hot water to be supplied from the water heater in the dishwasher control controlled to pump thermal wastewater through a heat exchanger when The withdrawal of hot water from the water heater takes place simultaneously with the supply for the water heater. Ensure that preheating of the water takes place. Hot water from pump 16 passes through hose 19 It is fed to the upper inlet connection 20 of FIG. 6 for the heat exchanger. The preferred structure is After passing through a heat exchanger, as will be explained below, the water flows through the lower outlet sleeve 21 of FIG. and is discharged from a tube 22 which passes from the lower housing to the underside of an outlet chamber 24. The outlet chamber 24 is directly discharged into the suspended cup 23. It is connected to a tank T for the purpose of holding water tfa in the pump inlet. Inside the exit chamber 24 The collected water is discharged through outlet 25 in FIGS. 1 and 5. Figure 1 cold The water inlet 27 is connected to a normal supply pipe (not shown) and also has a hot water supply for heat recovery. Lower ends of alternating tubes of heat exchanger E for upward flow as opposed to downward flow of water It is connected to the. Preheated feed water can project upward and forward through the σ fit 28, from the upper end of the heat exchanger to the upper side of the upper housing σ, inside the cover C. The water flows into the space of Supplied to the motor W. A hot water outlet pipe 30 extends rearward from the hot water heater and is used for washing dishes. It is connected to a flexible hose which is a normal hot water supply pipe for supplying hot water to the machine.

As in FIG. 5, the hot water heater W includes a cylindrical outer shell 31. , this shell 31 has a bottom disc 32 attached by means such as welding. There is.

The outer shell 31 is! Gasket 35t-interposed on top circular plate with fleas an inwardly extending upper flange 33 for attachment by means such as studs 36; The stud 36 is welded to the flange. inside shell 31 The portion includes a plate such as a cylindrical ring 37 spaced inwardly from this shell. 34 is provided with a partition attached to the bottom surface by means such as welding, and this partition A large central space 3 open at the ends and spaced from the disc 32 8, and heating is performed within this space 38. ing. This partition also forms a small annular entrance space 39, which is The introduced water flows downward through the ring 37 and around the lower edge of the ring 37 as shown by arrow 40. It's complicated. The inlet tube 29 extends through the shell 31 and also includes a fitting 41. This joint allows the introduced water to flow in a circle within the excess space 39 as shown by the arrow 42 in FIG. The cold water flows smoothly in the circumferential direction, as shown by arrow 40. and without causing turbulence (flows around the lower edge of ring 37, thereby heating The water flows uniformly from the central space through the outlet pipe 3 (1), and also flows through the heater When hot water is discharged from the tank, the introduced cold water is prevented from mixing with already heated water. It is. Space 39 receives heated water directly from the heat exchanger, so the temperature difference is It is small, and no insulation between the outer shell 31 and the heat exchanger E is usually required.

The water in space 38 is supplied by input type electric resistance heaters, such as six pairs of U-shaped heaters. Preferably, it is heated by a heater such as Calrod heater 44; Each pair of Kalrod heaters 44 is mounted on the plate 34 by hanging from the Zoroku 45. is lowered and receives current through the wires in cables 46 and 46'. When these wires are connected to post 47 in Figure 5, both extend through the conductor 48, which also extends rearwardly and downwardly. It extends to an electrical control box 49 which is located behind the upper housing σ. It is attached to the section. A thermostat 50 also extends through the plate 34. This thermostat has a terminal 51 and a plug 52 for installation. and is suspended from the plate in the center of the space 38. thermostat 50 is connected to a normal temperature setting device and a temperature indicator 55 by a wire in a cable 53. It is connected to a control box 54 having a. Cable 53 is also the main cable in FIG. It extends into a conductor 48 that leads to a conductor 49 .

Especially in the case of dishwashers called high-temperature dishwashers, the hot water heater reaches the boiling point. Heater 44 may be damaged due to localized overheating when supplying high-temperature hot water. In order to prevent this, a portion of the hot water from the outlet pipe 30 is pumped to the inlet by a pump 57. This pump moves in the direction of the arrow shown above. and is driven by a motor 58 having a control box 59. Pon The inlet of the pipe 51 is connected to a diameter reducing tee 60 installed within the pipe 30, and the outlet thereof The port is connected to a similar diameter reducing tee 61 mounted within tube 29. pump 5 7 is activated only when heater 44 is energized to prevent local overheating of the heater. It just stops. However, the operation of pump 57 usually results in a large amount of hot water. Tarasu. This is because the circulation through the inlet pipe 29 fills the entire space 38 with hot water and This is because warm water tends to fill the space 39.

The circulation by the bonder 51 eliminates the turbulent flow of water from the passage 39 around the lower edge of the ring 37. It doesn't obstruct the flow.

This is because although circulation produces a flow, the L joint 41 reduces turbulence in the flow. It is. Also, the heater 44 is installed inside the heater when the dishwasher requires hot water. The design must be such that there is a sufficient amount of hot water before the hot water is required. Or, at that time, the heater must be deenergized and the pump 51 must also be deenergized. Lana. Including Bonn 7'57 and associated circulating tees 60 and 61. As for parts, the savings can be made when hot water heaters supply so-called low-temperature dishwashers. must be taken into account.

As in FIG. 5, the tube 30 extends all the way through the plate 34 into the space 38. However, the pressure relief tube 62, whose position is different as in FIG. It has a nondle that is manually operated to release it at the desired pressure. It is connected to a pressure relief valve 63 which is regulated accordingly. The pressure relief valve 63 When moved, it will attach to the corner of the upper housing d as in Figures 3 and 4. This creates a flow through a tube 64 extending downward and is discharged into the tank section. of tube 64 The lower end is actually located on the front side of the lower housing L, not the rear side, but the fifth In the figure it is indicated by a dotted line and its relative lateral position is fully indicated.

Regarding heat exchanger E, the hot water introduced is from the inlet fitting 20 in Figure 3. A series of coiled tubes are fed through tube 65 through L fittings 66 and sleeves 67. 68, 69, 70, 71, 72 and 73, and these inlets The ends are enclosed within a sleeve 67 and sealed together. tube 68 The other end of .about.73 is connected to the sleeve 21 in FIG. Cold water outlet 28 in Figure 1 is connected to three differential 4, and this sleeve is similar to sleeve 67. are connected to the upper ends of coiled tubes 75, 76, 77, 78, 79 and 80, Each of these coiled tubes! It is wound in a coil together with 68 to γ3, and this This causes tubes 68 and 75 to alternate in the first inner coil as shown in FIG. , tubes 69 and 76 are alternated in the second coil, and tubes 70, 71 and 76 are alternated in the second coil. 71.78, tube 72.79 and tube 73.80 are alternately inserted in the next coil. It is now possible to

The tubes in each coil are wound in a groove between two tubes in the preceding coil. A thermally conductive filler is filled between the tubes when the tubes are rolled up. tubes 75-80 The lower end is similar to sleeve 74 in FIG. 6, but with cold water entry at inlet 27 in FIG. It is received by a sleeve connected in the usual manner to the oral canal. Heat exchanger Plastic is injected into the space around the opening up to the top of the upper housing H. A thermal insulator 81, such as a foam, may be placed around the heat exchanger E. This insulation Supports the heat exchanger during transportation. around tubes 29 and 30 and the upper halves. It surrounds the parts that extend above the housing and has a strip for extending the parts to the outside. There is also a break in the internal space of the cover 〇, which is formed by lots 82, 83, 84 and 85. A heating element can be cast.

The front wall 87 of the lower housing L is formed with a generally rectangular opening 88 as shown in FIGS. This opening is located at the screen 110 angle shown in FIGS. 4, 5, and 7. a narrow lower portion forming a ridge for receiving the tensioned slide flange 89; has. The screen 11 allows all of the wastewater to pass through, but it is larger than the preset size. A suitable diameter hole is formed to trap food debris. This screenplay The cover 90 to which the horn 11 is attached has latches 91 on each side as shown in FIG. It is removably attached to the front wall. Of course, remove the latch 91 for the screen. It is removed by removing the front cover and screen with it, and then removing the screen. After purifying the lean cover and screen are reinstalled. According to the present invention If so, improvements in screen sealing and installation may be made in advance by means such as contact. includes attachment to plate 92, which allows the screen to attach to the series of points shown in FIG. It can be attached to and detached from the plate 93 in the usual manner by means such as the bolt 94. These bolts can also be mounted between the front plate 92 and the mounting plate 93. The plate 93 is molded to hold the socket 95, and the plate 93 is attached to the plate 93. It has a spring edge 96tl, which engages with the inside of the top and bottom of the li-90 and both ends. be done. The gasket 95 is rectangular and has convex lips 97 on all four sides. The mounting is done between the front plate 87 and the plate 93 around the opening 88. It is compressed at the position where it is recessed from all edges. However, the socket 95 is made of a suitable compressible material, e.g. made of bim or plastic to form the desired seal.

When the screen is inserted, one flange 89 of the screen has an angular shape as shown in FIG. guide, slid along the top flange of =-98 and opposite flange 8 9 is a plate suspended from the top wall 101 of the lower housing L. 100 along the flange 99 on the lower edge. As in Figure 7 The guide bar 98 extends between the front wall 87 and the rear wall 102 of the lower I housing. can be installed. Below the outer lower edge of guide angle 98 as in FIG. The other baffle 105 extends laterally of the cup 23 and also extends below the screen 11. Excess waste liquid from the tank overflows to outlet section 24 and further to outlet 2. 5 and allow it to flow through hoses or pipes to the sewer, or to other parts of the equipment. It is made into Noh. The baffle 105 is installed by extending between the front wall 87 and the rear wall 102. and is also attached to the bottom wall 106 of the lower housing, with support legs thereunder. 107 is installed. The legs 107 allow the suspended sump 13 to touch the floor 108. Not as high as it should be.

One advantage of the outlet section 24 is that the inlet for waste dishwashing water is separate from the outlet section 24. Being on the other side of the screen tends to cause screen 11 to self-purify. The goal is to do what is shown. This will prevent the screen from becoming clogged. Also, the wastewater crosses the screen and over the side flange 89 to the outlet or discharge section. It tends to flow and carry away the material that clogged the screen. similar mother-in-law The result is a failure of the float or level indicator 18 in the pump 16, causing one cycle to fail. When the water level in the tank exceeds the top of the baffle 105 without draining water from the tank. It also happens when you are elevated. In such cases, it is necessary to continue past the screen. Although water tends to overflow over the baffles, complete wastewater drainage is not possible. This overflow is not sufficient in terms of water flow and excess water flows across the screen. exit section 24, carrying with it any material captured by the screen. It shows a tendency to be carried away.

The alternative water heater 1 of FIGS. 10-13 includes a tubular shell 31, which The cable is attached to the roughly semi-elliptical upper navel by welding or other means. This head is inserted through a suitable opening formed in the upper partition 119 of the heat exchanger. This heat exchanger has been extended to include tubes 68.69.70 and 75.76.77f. : and these tubes are arranged as already described. Upper housing U' The plate 120 and the flanged plate 121 extend above the partition 119. , a top plate (not shown) is taken across the top of plates 120 and 121. Can be attached.

The lower end of the shell 31 is closed by a semi-elliptical lower head 122 as shown in FIG. This head is also welded to the sleep. This semi-elliptical belly button allows the use of thinner materials, thereby reducing the cost of molding the water heater.

The water heater is supported from the partition 118 by a series of removable brackets 123. held. Insulation 124, such as fiberglass, in addition to the heat exchanger tubes Similar insulation material 125 is provided surrounding the heater, and a similar insulation material 125 is provided around the heat exchange tube. Prepared to roll around. Insulating material 81' such as urethane foam is also an insulating material. 125 and the outer shell of the upper flange U'. As mentioned above Inlet pipe 29 for fresh water preheated by a heat exchanger is connected to upper head 118. Enter the top of the tank near the outer edge of the tank and drink the water heated by the water heater. The outlet pipe 30 for supplying the dishwasher is located near the center of the upper head 118. Connected at Also, the pressure relief pipe 62' is connected to the center part of the heater tank. The pressure IJ is then extended to the valve 63' and the discharge pipe 64'. A discharge pipe 64' extends downwardly at a corner of the upper housing U' to form the terminal shown in FIG. Discharge into the wastewater tank corresponding to tank T. Three electrical heating elements or heaters 127 extends inside the central portion of the tank in the same manner as for the central portion of FIG. and each is engaged with a threaded ring fitting. Each heater - are externally threaded and engage cooperating threads on the inside of the corresponding ring 128. This ring is tubular and has an axial direction formed in the upper head 118. The head is welded all the way around to keep it upright and extends through a circular hole aligned in the direction. welded to the top of the

The temperature adjustment control device R129 for the heater 127 is connected to the sensor via the cable 130. -131, and this sensor can be connected downwards to the center of the tank. is extended and engaged with an internally threaded ring fitting 132; The fitting is installed similarly to ring fitting 128. Also, high temperature control The regulator 133 can be connected to the sensor 135 by a cable 134; The sensor is inside the tank: /C is extended to the internal threaded ring fitting 128 Similarly screwed into. High temperature regulator 133 is connected to heater 127 and/or It can be connected to the control device for the valve 63'. Accordingly, the lower housing in FIG. A lower head 122 extending downwardly to the top wall 101' of the rod L' has a central threaded glass. A depending nipple 138 with 139 can be provided, which plug is connected to the tank. Drain any residue such as falling debris from the electric heater that collects on the bottom. removed when The first A series of holes can be formed in the upper head 118 as in FIGS. 2 and 13; These holes relate to the ring fitting 128 for the heater 127. hole 141, hole 142 for inlet pipe 29, hole 143 for outlet pipe 30, and Respective ring fittings 132 and 136 for the sensor Holes 145 and 146 are included.

The alternative upper head 150 of FIG. The heater is specifically configured to accept a single electric heater.

Upper head 150 is generally semi-elliptical but has a flat portion 151 at the top, where A hole 152 for the heater is formed, and a heater hole 152 is formed for the flat portion 151. All studs are included to bolt the turf flange in place. this In this structure, the hole 141 (i) of the upper head shown in FIG. 12 and FIG. Weld the threaded finting to the curved surface of the upper head when attached Alternatively, use a heater with a flat mounting flange. enable. This alternative head 150 can fit one or more sensors. Small holes 153 and 154 can be provided for openings and exit pipes. Of course In theory, a hole for an inlet pipe such as hole 142 in FIG. 12 is shown in FIG. The position is closer to the edge of the head than the hole.

Still another water heater W'' of FIGS. 15 and 16 includes a tubular shell 31, which The shell is attached to the generally semi-elliptical upper head 157 by means such as welding. 10, and this head is fitted with a suitable opening formed in a partition corresponding to partition 119 in FIG. A bracket that extends through the mouth and is used to attach the water heater to the partition. The cut 123 is the preparation. The lower edge of the shell 31 is enlarged by means such as welding. The body is attached to a semi-elliptical lower head 126, which is connected to a drain plug 139. A threaded nipple 138 is provided depending therebetween. For example, if the quantity is 3, Excluding lateral flat flanges with holes for engagement studs that are not externally threaded the outer edge to support a heater corresponding to heater 127 in FIG. three pre-formed annular flat portions 15 excluding a large radius arc portion 161 at 8. 159 and 160 have a central hole 162 and stands 16 arranged in a ring shape. 3, and these flat portions are equally spaced around the upper head 157. It is. Each flat portion is formed by the bottom of a well 164; Cold or hot working prior to drilling 161 and installing stud 163 The studs 163 arranged in a ring shape are arranged in the form of a ring. Positioned to engage a series of countersunk holes formed in the flat mounting flange. be taught. This mounting flange is normally formed on the heater and has a flat section 1 5B, 159 and 160 and the arrangement of the ring-shaped stand 163 are eliminates the need to weld large specialized fittings for done to. There is a depression in the well where a flat part is formed, and the length of the heater is The length of the heater V in Figures 10 and 11 may also be slightly shorter. However, the heater is extended within the tank as usual. In addition, the head 157 is a threaded nipple for a pressure relief valve such as valve 63' in FIG. 165, and a pair of sensors such as those corresponding to sensors 132 and 135 in FIG. A spring-mounted Nizzol 166 for the sensor is installed. Top edge 169 and bottom A partition or ring 168 having an edge 170 is attached to the inside of the shell and An annular entrance space 171 is formed in the inner recess of 31, and this entrance space It is generally much smaller in thickness and volume than the gap 172.

The inlet tube 29 is connected to the outer edge of the upper head 157 and the ring as in FIG. 168 and is also welded to the head, while the link The upper edge 169 of the plug 168 engages the inside of the upper shell 157 and also the upper edge 169 of the inlet tube 29. It is attached to the upper shell by welding at the immediate inner position. In Figure 16 , each arcuate portion 16 at the outer edge of the flat portions 158, 159 and 160. 1 is formed to match the diameter at the outer edge of the partition ring 168; The upper edge 159 of the ring engages the underside of each flat portion just inside the arcuate portion 161. match. Continuous welding is not required to attach the partition 168 to the inside of the head 157. stomach. This is because for the underside of each flat portion 158, 159 and 160 the partition 1 A series of tack welds are made in attaching the upper edge 169 of 68, and This is because it is sufficient to tack weld each two of the flat parts together; The reason is that the heat leaking into the outer space 171 is caused by the flow of introduced water from the outer space to the inner space. between the inner space 172 and the outer space 171. This is because a small amount of leakage is acceptable.

A deflection plate 174 is located between the ring 168 and the upper head 157, as shown in dotted lines in FIG. 2D. It is located just below the lower end of the inlet pipe 29 so that the 5, the lower end edge 175 of the tube 29 is shaped to follow the inside of the head 157. It extends through the drilled hole and is welded to the head on the outside. In Figure 18 As such, the deflection plate 174 has an upright flange 176 that extends from its outer end. Along the edge and against the inside of the head 157 as in FIG. and the shell 31 to the head, tack welding is performed. Ru. As in FIG. 18, the outer edge 177 of flange 176 It is shaped to fit inside the. The deflection plate is curved as shown in Figure 19. A section 178 joins the upright flange to the horizontal section and allows the incoming cold water to exit from the pipe 29. The notch 1 on the edge of the deflection plate 175 ensures that the 79 fits against the outer edge of ring 168 as in FIG. obvious This deflection plate 174 has the same structure as already explained in connection with the L joint in FIG. , the incoming liquid circulates around the space 171 between the ring 168 and the shell 31 in an annular manner. Let it flow. The inflow water flows in an annular manner and circulates around the ring 168. While the inflowing circulating water is preheated by the hot water in the ring 168, The temperature outside the unit is determined by a heat exchanger corresponding to the heat exchanger having tube 68 etc. in the figure. This is done so that it is insulated from the inside.

The lower edge 170 of the ring 168 is connected from the outer space 171 of the ring 168 to the inner side of the ring. In order to increase the flow velocity of water as it flows into the space 172 of For this reason, it is very close to the inside of the lower head 126. Is this flow a heater? tends to retain particles within the circulating flow that would otherwise fall from the The small pieces are sent to a dishwasher or the like along with water supplied by a heater. but The large pieces or grains settle to the bottom of the r122 and are collected, from where they are periodically drained. It is removed through the lens plug 139.

The alternative water heater 1 of FIGS. 16 and 17 is the unit of FIGS. 10 and 11. It can be used as a unit corresponding to the unit U', i.e. the inlet pipe 29 and the outlet pipe 3 0 and similarly in the flat portions 158, 159 and 160 respectively. It has a heater corresponding to the heater 130 to which the flange is attached. a pressure relief valve and a nipple 166 attached to the nipple 165 respectively. one sensor controls the heater. In addition to controlling the temperature, the other sensor is a high temperature sensor, and this sensor is If the operation of the pressure response characteristic fails, the relief valve will be activated even if the condition is be made to do. That is, the high temperature sensor is used in the pressure response mechanism of the relief valve. The relief valve is set at a temperature corresponding to a slightly lower pressure than the pressure-responsive machine The system automatically activates when the high temperature sensor exceeds the pressure corresponding to the set temperature. do.

The head shown in Figure 14 has been described above and therefore requires only one electric heater. When a small heater capacity is desired, as is required, FIGS. 15 and 16 It replaces the upper head 151 in the figure. As already explained, the Herage 150 One flat portion 151 is formed in the center. This is the easiest position to form. This is because it is possible. Furthermore, one corresponding to the stud 163 in FIGS. 15 and 16 A series of stands are mounted around hole 152 on flat portion 151 of FIG. . The head 150 in FIG. 14 is attached to a shorter shell than the shell 31 in FIG. The diameter of the R150 is reduced and the shell is also made smaller. is required for small heaters where only one electric heater is needed. an internal ring corresponding to ring 168 in FIG. 16 to provide volume; rim (extended very close to the lower head 122 to increase the velocity of the introduced water) Again, this is caused by the formation of particles and particles. This is to obtain circulation. To explain again, large pieces and large grains are shown in the lower header of Figure 11. It shows a tendency to be collected at the bottom of the door 126, and by removing Zorag 139, it can be removed periodically. It is drained from there. The heater tank is located in the center on screen 11 in Figure 5. Because of this, all water drained from the heater tank flows into the tank. This water flows through a heat exchanger, thereby avoiding loss of the heat it holds. Wear. As will be apparent, any large particles or After passing through a heat exchanger, the large particles are discharged into an outlet cup where they are subsequently removed.

Alternative Water Heater 1 in Figures 10 and 11 and Updates in Figures 15 and 16 The operation of the other alternative water heater W" is based on the lower edge and lower part of the ring 168 in FIG. The wire pulling effect due to the small space between the pad 122 and the wire drawing effect shown in FIGS. 10 and 11 coupled to the concave portion of the lower head 122 of FIGS. Small particles can be circulated through the corresponding ring gap of the alternative water heater T. However, large particles can be collected without impairing the flow of water flowing into the heating space. Although it is K, it is essentially the same as the previous one. This is shown in Figure 10~ An additional advantage of the water heater construction of FIGS. 14 and 15-19.

While two or more preferred embodiments of the invention have been illustrated and described, other It is understood that embodiments may be made without departing from the spirit and scope of the invention. It will be understood that significant deviations can occur.

international search report 1+ wo ma1m’mAH-u-11m PC/US 84100849

Claims (18)

[Claims] 1. An energy recovery unit for dishwashers and similar equipment, having coils surrounding a central space, each said coil mutually and also adjacent coils; a first and a second tube arranged in a heat exchange relationship with the tube in said The first and second pipes contain warm waste water and heat from dishwashers and similar equipment. a heat exchanger, each adapted to convey cold water to be supplied to a water heater; , a wastewater inlet and an outlet for the pipe, wherein the heat exchanger carries warm wastewater; a feed water inlet for said pipe for conveying cold feed water and a connection with said warm waste water; having a feed water outlet heated or warmed by heat exchange; an inlet device or an inlet device located in the central spatial circle and connected to the feed water outlet of the heat exchanger and an outlet device for supplying hot water to said dishwasher and similar equipment. a hot water heater including a storage device for water to be heated; a device for supplying the wastewater from the device to the wastewater inlet of the heat exchanger; a device for applying heat to water in the water storage device of a hot water heater; An energy recovery unit comprising: 2. The water storage device of the hot water heater includes a tank for storing water to be heated. , The heating device may include one or more electrical left-hand type heaters in the tank. 2. The energy recovery unit according to claim 1, comprising: a. 3. The tank is upright, and the top is entirely curved upward in a convex shape, At least one flat portion is formed on the top, and an electrical connection is made to the flat portion. means for attaching a feed-in type heater or a lateral flange that engages said part. have, An energy recovery unit according to claim 2. 4. Each of said flat portions is generally horizontal and is connected to said electrically connected type heater. each mounted substantially upright; An energy recovery unit according to claim 3. 5. the hot water heater includes an upright tank containing water to be heated; The tank has an upper end and a lower end, and an inwardly spaced rack suspended from the upper end. a partition defining an inner heated space larger than the outer inlet space; The tank terminates above the lower end of the tank, and the outlet device is connected to the inner space. and the inlet device is connected to the upper end of the outer space. the law of nature, before the heater flows into the inner space through the underside of the lower end of the partition. means for forming an annular circulation of the inlet water around the inlet space; An energy recovery unit as claimed in claim 1, including heating means. 6. the tank has an outlet for hot water communicating with an upper part of the inner heating space; The partition is in close proximity to the bottom edge of the tank and may fall from the heater. This creates a flow of incoming water that tends to circulate small particles to the outlet. It's on, An energy recovery unit according to claim 5. 7. The lower end of the tank communicates with the inner heating space to collect particles that have fallen from the heater. Drain means large enough to prevent the removed material from being recycled to said outlet. equipped, An energy recovery unit according to claim 6. 8. The means for causing circular circulation in the introduced water, extending downwardly through the top of the tank to communicate with the outer inlet space. tube and located below the tube substantially across the inlet space and spaced rearwardly from the tube. a deflection plate having spaced apart generally upright flanges; An energy recovery unit according to claim 5, comprising: 9. An energy recovery unit for dishwashers and similar equipment, comprising: a coil surrounding a central space; Includes first and second pipes carrying waste water and cold water to supply the hot water heater, respectively. The heat exchanger that is Wastewater inlet and outlet for the pipes in which the heat exchanger carries warm wastewater, supplying cold water feed water inlet for said pipe carrying said water and heated by heat exchange with said waste water. i.e. having a feed water outlet for heated water; supplying the wastewater from the dishwasher etc. to the wastewater inlet of the heat exchanger; means disposed within said central space and connected to a feed water outlet of said heat exchanger. An inlet device and an outlet device for supplying hot water to the dishwasher etc. a hot water heater comprising a tank containing water to be heated; and at least one tank in the tank. two generally upright electric input heaters; When the heater is in a heating state, from the outlet to the inlet of the hot water heater independent of the hot water supply to said dishwasher for circulating a portion of the water; a closed circulation device; Energy recovery unit containing. 10. a circulation pump connected to an outlet device of said tank and an inlet of said tank; having an outlet connected to an inlet device; An energy recovery unit according to claim 9. 11. an inlet tube for the heater extends from the heat exchanger to a position above the heat exchanger; and an outlet tube for the heater extends above the heater; the circulation pump is connected to the upper inlet and outlet pipes of the heat exchanger and heater; 11. The energy recovery unit according to claim 10, wherein: 12. An energy recovery unit for dishwashers and similar equipment, comprising: a coil surrounding a central space; Includes first and second pipes carrying waste water and cold water to supply the hot water heater, respectively. The heat exchanger that is Wastewater inlet and outlet for the pipes in which the heat exchanger carries warm wastewater, supplying cold water feed water inlet for said pipe carrying said water and heated by heat exchange with said waste water. i.e. having a feed water outlet for warmed feed water; an inlet device or an inlet device located within the central space and connected to the feed water outlet of the heat exchanger; and a hot water heater equipped with an outlet device for supplying hot water to the dishwasher, etc. , supplying the wastewater from the dishwasher etc. to the wastewater inlet of the heat exchanger; means and connected to the top of said heater to release overpressure caused by heat and a relief valve installed in front of the unit to receive dishwashing water, which is waste water. A tank is included on the lower side of the heat storage exchanger, and the tank is connected from the relief valve to the tank. an energy recovery unit comprising: a tube extending to; 13. a laterally rectangular housing surrounding the heat exchanger; the tube extending from the relief valve extends through a corner of the housing; 13. The energy recovery unit according to claim 12, comprising: 14. Waste energy is recovered from dishwashers with washing and flushing cycles, etc. A method for collecting waste water from the dishwasher, etc., in a collection tank located at a lower position. send it to the This wastewater is collected from the collection tank surrounding a hollow central space and this wastewater is Sets juxtaposed to carry chilled water carried by one set of pipes and supplied by another set of pipes to a heat exchanger having a coil formed by a tube; flowing the wastewater and feedwater in countercurrent relationship through the heat exchanger; heating the water in the water heater; supplying hot water from the hot water heater to the dishwasher at selected times; Energy recovery method encompassing stages. 15. The preheated inlet feed water is passed through the large inner space of the hot water heater tank and below. circulating downwardly and annularly within an annular outer space connected only by the ends; applying heat to the water within the inner space; 15. A method of recovering energy according to claim 14, comprising the steps of: 16. A generally upright electrical resistance input heater is used to control the inner space. 16. The method of recovering energy as claimed in claim 15, comprising applying heat to water. 17. from the outlet of the inner heating space to the outer space through a closed circuit conduit; circulating water independently of the hot water supply to the dishwasher; 17. The energy recovery method according to claim 16, comprising: 18. Waste energy is recovered from dishwashers with washing and flushing cycles, etc. A method for collecting waste water from the dishwasher, etc., in a collection tank located at a lower position. Send it to Kuyen, This wastewater is collected from the collection tank surrounding a hollow central space and this wastewater is Sets arranged side by side to carry cold water carried by one set of pipes and supplied by another set of pipes to a heat exchanger having a coil formed by a tube; flowing the wastewater and feedwater in countercurrent relationship through the heat exchanger; Flowing the preheated feed water to a hot water heater located in the central space of the heat exchanger. death, heating the water in the hot water heater circle; removing excessively humid and/or pressurized fluid from the hot water heater; directing the displaced fluid to the wastewater collection tank and discharging the dishware from the hot water heater; Provides hot water to the washing machine when selected, Energy recovery method encompassing stages.